Internal combustion engine



FIG. 1 is a front elevational view of an internal combustion engine constructed in accordance with the new, improved, original, and ornamental design embodying the present invention;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a right side elevational view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof;

FIG. 7 is a right rear perspective view thereof; and,

FIG. 8 is a left front perspective view thereof. 

The ornamental design for an internal combustion engine, as shown. 